diff --git a/nginx/nginx.conf b/nginx/nginx.conf
index 71be6f0..b4d4f68 100644
--- a/nginx/nginx.conf
+++ b/nginx/nginx.conf
@@ -157,11 +157,22 @@ http {
                         return
                     end
                     
+                    -- 记录请求体大小，方便调试
+                    ngx.log(ngx.INFO, "Received body size: ", string.len(body))
+                    
                     -- 解析 JSON
                     local ok, data = pcall(cjson.decode, body)
                     if not ok then
+                        -- 记录解析错误的详细信息
+                        ngx.log(ngx.ERR, "JSON parse error: ", data)
+                        ngx.log(ngx.ERR, "Body preview (first 500 chars): ", string.sub(body, 1, 500))
                         ngx.status = 400
-                        ngx.say(cjson.encode({error = "Invalid JSON"}))
+                        ngx.say(cjson.encode({
+                            error = "Invalid JSON",
+                            details = tostring(data),
+                            body_size = string.len(body),
+                            body_preview = string.sub(body, 1, 200)
+                        }))
                         return
                     end